<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title></title>
        <style type="text/css">
           .lv {
                color: red;
            }
        </style>
    </head>
    <body>
        <div>绿叶学习网</div>
        <p class="lv">绿叶学习网</p >
        <span class="lv">绿叶学习网</span>
        <div>绿叶学习网</div>
    </body>
</html>